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Microsecond unfolding kinetics of sheep prion protein reveals an intermediate that correlates with susceptibility to classical scrapie.

Abstract：

:The microsecond folding and unfolding kinetics of ovine prion proteins (ovPrP) were measured under various solution conditions. A fragment comprising residues 94-233 of the full-length ovPrP was studied for four variants with differing susceptibilities to classical scrapie in sheep. The observed biexponential unfolding kinetics of ovPrP provides evidence for an intermediate species. However, in contrast to previous results for human PrP, there is no evidence for an intermediate under refolding conditions. Global analysis of the kinetic data, based on a sequential three-state mechanism, quantitatively accounts for all folding and unfolding data as a function of denaturant concentration. The simulations predict that an intermediate accumulates under both folding and unfolding conditions, but is observable only in unfolding experiments because the intermediate is optically indistinguishable from the native state. The relative population of intermediates in two ovPrP variants, both transiently and under destabilizing equilibrium conditions, correlates with their propensities for classical scrapie. The variant susceptible to classical scrapie has a larger population of the intermediate state than the resistant variant. Thus, the susceptible variant should be favored to undergo the PrP(C) to PrP(Sc) conversion and oligomerization.

journal_name

Biophys J

journal_title

Biophysical journal

authors

Chen KC,Xu M,Wedemeyer WJ,Roder H

doi

10.1016/j.bpj.2011.07.024

subject

Has Abstract

pub_date

2011-09-07 00:00:00

pages

1221-30

issue

5

eissn

0006-3495

issn

1542-0086

pii

S0006-3495(11)00882-4

journal_volume

101

pub_type

杂志文章

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